National Geographic is carrying news of the discovery of the oldest ocean-going vessels found to-date. Estimated to be about 4,000 years old, these Egyptian vessels resembled scaled up versions of Nile riverboats. They were built in pieces and then hauled across the desert to be assembled at a temporary Red Sea port. It's thought they made voyages as long as 1000 miles, but most likely followed coasts instead of striking out over open water.